code: def _value(self) -> str:
      if self.data:
          return ", ".join(self.data)
  
      return ""
  
file_path: superset/superset/forms.py
imports: import json
  import os
  from typing import Any, Optional
  from flask_appbuilder.fieldwidgets import BS3TextFieldWidget
  from flask_babel import gettext
  from wtforms import Field, ValidationError
label_desc: Use image node_id 1 for calling the CommaSeparatedListField obj's underlying member method code with example usage: obj._value() and returns: str, str